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(x-13)+(3x+1)=90
We move all terms to the left:
(x-13)+(3x+1)-(90)=0
We get rid of parentheses
x+3x-13+1-90=0
We add all the numbers together, and all the variables
4x-102=0
We move all terms containing x to the left, all other terms to the right
4x=102
x=102/4
x=25+1/2
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